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Provenance of the Late Permian Xuanwei Formation in the Upper Yangtze Block: Constraints from the Sedimentary Record and Tectonic Implications
投稿时间:2018-10-04  修订日期:2018-12-20  点此下载全文
引用本文:ZHANG Yingli,JIA Xiaotong,WANG Zongqi.2019.Provenance of the Late Permian Xuanwei Formation in the Upper Yangtze Block: Constraints from the Sedimentary Record and Tectonic Implications[J].ACTA GEOLOGICA SINICA(English edition),93(6):1673~1686
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DOI:10.1111/1755-6724.13866
作者单位E-mail
ZHANG Yingli 1 MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China yinglizh@126.com 
JIA Xiaotong 2 Engineering Seismology Institute of Zhejiang Province, Hangzhou 310013, China  
WANG Zongqi 1 MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China  
 
Author NameAffiliationE-mail
ZHANG Yingli 1 MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China yinglizh@126.com 
JIA Xiaotong 2 Engineering Seismology Institute of Zhejiang Province, Hangzhou 310013, China  
WANG Zongqi 1 MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China  
Abstract:Xuanwei Formation is composed of mudstone, siltstone, and sandstone, with local conglomerate. However, its provenance and tectonic setting have been scarcely studied. In this paper, we use sedimentology, electron probe microanalysis (EPMA), and detrital zircon dating to investigate its source area and depositional tectonic setting. The facies assemblages indicate that it formed in alluvial fan and fluvial river sedimentary environments. The strata thicknesses and facies distribution indicate that the sediment supply was from the west. The results of EPMA show that chromian spinels within the sediments are characterized by high Cr# and varying Mg#. Discrimination plots suggest that these spinels were sourced from large igneous province (LIP) magmatic rocks. The laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U–Pb chronology of detrital zircons suggests that the sediments were derived from intermediate–acid igneous rocks dating back to 251–260?Ma. We could, therefore, conclude that the provenance of the Xuanwei Formation is from Emeishan basalt and synchronous felsic igneous rocks, which is consistent with the composition of the detrital framework. The detrital zircon dates also suggest that felsic magmatism occurred during the Late Permian, not after the eruption of the Emeishan basalt. Based on the sedimentary successions and provenance analysis, the tectonic setting for Xuanwei Formation deposition was a volcanic rifted margin.
keywords:Xuanwei Formation, provenance analysis, chromian spinel, detrital zircon geochronology, volcanic rifted margin
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